To me campaigns are preferable
bo2 mps is much better than bo1 in balancing and Customization (especially for the pick 10 system which gives so much for different play styles) and diversity in guns
for zombies i say yeah tranzit and die rise might be annoying asf for most people but the other last 3 maps are so good it elevates the whole game to be near perfect zombies
And Nuketown is a challenge for testing your skills as zombies player